OPERATION FEATURES cont..
OPERATION FEATURES cont.
6.8 Low Battery Detection and Replacement cont.
.5 Compressor Protection cont.
NOTE: The installer can reset the thermostat and bypass the compressor protection
features by pressing the RESET button. This will erase all entered programs, current
time of day, day of week and other user settings and should only be used during
installation for testing purposes or to reset a thermostat to regain normal operation.
This will return all Thermostat settings to their default values. The user will have to
re-program all of the erased settings.
When this feature determines that the back-up batteries status is low, low battery indicator
will appear in the display. The thermostat will continue to function normally if AC power is
provided, but it is strongly recommended to change the back-up batteries as soon as
possible to avoid possible program loss due to AC power outage or rolling blackouts. This
thermostat requires 24 Volt AC Power for normal operation and control of the heating or
.6 High Temperature Safety Switch
While the thermostat is in the HEAT mode of operation (selector switch in the HEAT position),
the thermostat will mechanically turn-off if the room temperature raises higher than 99˚F
(37˚ C). There is also a software feature that will automatically turn-off the thermostat in
HEAT mode if the temperature raises higher than 93˚ F (34˚ C).
Read BEFORE proceeding
Press RESET button using a paper clip or a small pencil tip. This will reset the
thermostat and return all settings to their default values. Verify your thermostat is
controlling your system, see Testing Your New Thermostat. If the problems still persist,
call a professional service technician immediately to verify proper system operation.
.8.1 Replacing the Back-up Batteries
Open front thermostat door and locate the battery compartment door.
Gently remove the two "AA" alkaline batteries located in the battery compartment.
.7 Changing Fahrenheit (°F) to Celsius (°C)
3. Install two new "AA" alkaline batteries into battery compartment. Make sure to match
the positive (+) ends of the batteries with the positive (+) terminals located in the
Release the front thermostat body from the rear thermostat body by pressing the release
latch on the bottom of the thermostat.
Close battery compartment and verify that the low battery indicator does not appear in
Gently separate the two thermostat halves and turn the front thermostat body over exposing
the rear view of the circuit board.
Locate the internal ˚F / ˚C switch on the circuit board.
.9 Resetting Thermostat
Using your fingers, gently flip the switch towards the preferred temperature ˚F / ˚C scale.
The Reset feature allows the user to completely reset the thermostat to register new manual
F / ˚C temperature scale switch settings.
. Reattach the front thermostat body by locating the top mounting lugs and swinging the
thermostat down until the release latch locks.
To erase all entered programs, current time of day, day of week and other user settings,
gently press RESET button using a paper clip or a small pencil tip.
Press the RESET button on the front of the thermostat using a paper clip or a small pencil
tip. This will register the new temperature scale default.
This will return all Thermostat settings to their default values and register all new manual
˚F / ˚C temperature scale switch settings.
NOTE: Resetting the thermostat by pressing the RESET button will erase all entered
programs, current time of day, day of week and other user settings.
This will return all Thermostat settings to their default values. Changing ˚F / ˚C temperature
scale default should be done prior to installation and before any programming to avoid loss
during reset step.
.10 Multi-Colored LED Status Indicators
The three multi- colored LED Status Indicators located on the front of your thermostat above the
display will notify you of key system information.
.8 Low Battery Detection and Replacement
AUX (Green): This will turn on when the auxiliary second stage of heating is active. The
NOTE: This thermostat requires 24 Volt AC power for normal operation and control of
auxiliary stage of heating is usually the least economical stage of heat.
the heating or cooling systems. This thermostat also requires two (2) properly installed
AA" alkaline batteries to retain user settings and programs in the event of loss of AC
CHECK (Red): Indicator will activate when a malfunction occurs in the heat pump system.
When the light is active, call a professional service technician to verify system
performance and switch the system to Emergency Heat Mode if required to
maintain room temperature.
Power due to power outage or rolling blackouts.
This thermostat is equipped with a low battery detection feature that constantly monitors the
back-up batteries during normal operating mode to determine whether they have sufficient
power to provide proper back-up operation.
EMER(Red): This indicator will light when you select Emergency Heat Mode of operation using
the system selector switch. When you select Emergency Heat Mode, the heat
pump stage of heat is turned off and the emergency (auxiliary) stage of heating is
used to maintain the setpoint temperature.